Malicious PDF — malware analysis report

Static analysis result for SHA-256 835b0c9a23409655…

MALICIOUS

PDF

63.5 KB Created: 2020-11-02 17:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 828454fe21dd133ff4d0e94e492567a4 SHA-1: e257a1054ff60277197240735d65041c7d6b0a3b SHA-256: 835b0c9a23409655a6e0ee418311f386b28d6082fbe462103955e01167e3d959
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to a redirector URL associated with malicious activity. The document body, though heavily obfuscated, contains the primary redirector URL and several benign-looking PDF links, suggesting a lure for users to click through to malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=one+point+perspective+room+with+stairs In PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/1775039.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/3969f5b0f.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/fadezibog.pdfIn PDF document text
    • https://nofexozodaxo.weebly.com/uploads/1/3/4/5/134522082/jobasul.pdfIn PDF document text
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/3050154.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/1eac5f5f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0087/5173/files/16387109467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0053/0597/files/kumpulan_game_offline_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2888/7714/files/89129550245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8530/9103/files/how_much_is_a_pound_of_fools_gold_worth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5449/0012/files/fepimaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2333/9167/files/3987916990.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6951/4143/files/discord_nuke_bot_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/bigojipoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/62346800622.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B8 5320 bytes
SHA-256: f53aca20f31fbaea5d083bd83e1a888e87e5b6976e3fca5e874b90d131ba240b
font_01_sfnt_off0000c4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B1 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 10272 bytes
SHA-256: a2de77e793a6e12bd7b4f413e9c3d8823bc82435766b8bbba38a47757e180af5

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