Malicious PDF — malware analysis report

Static analysis result for SHA-256 7387e024e623f2f5…

MALICIOUS

PDF

46.4 KB Created: 2020-10-28 21:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9897eb9e3a64a23a269db47e1b0dd62 SHA-1: 9e9d295339585315eb4d4c7aa4e8617558176e61 SHA-256: 7387e024e623f2f520f2e3a14d59ecff0b503cfaf724a2393fbbd9e765948593
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'ggtraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to a potentially harmful site. No scripts were extracted, but the presence of multiple external links points to a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=dividing+scientific+notation+with+different+exponents
    • https://cdn-cms.f-static.net/uploads/4393363/normal_5f96ba546b84d.pdf
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f96944ab2f1b.pdf
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f921547befad.pdf
    • https://cdn-cms.f-static.net/uploads/4407306/normal_5f93ca325d2c4.pdf
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/5855783.pdf
    • https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/wepibexub.pdf
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/baf847277b73.pdf
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/movijodaga.pdf
    • https://kugixixubeleji.weebly.com/uploads/1/3/4/3/134324677/gurige-telopezinuzev-sutuv-niwuf.pdf
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/fulukit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7d23fae6-cce7-4c9a-b264-40cd729d97e3/43985789866.pdf
    • https://cdn.shopify.com/s/files/1/0500/1392/9630/files/possessive_noun_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0488/4565/2133/files/blue_collection_box_locator.pdf
    • https://uploads.strikinglycdn.com/files/67094841-c912-4d5f-b954-c278cc2cc6e0/49135981111.pdf
    • https://cdn.shopify.com/s/files/1/0268/7588/7802/files/best_journal_app_for_android.pdf
    • https://uploads.strikinglycdn.com/files/af335b34-2746-4c6f-8146-26a4c52d8007/tidomososo.pdf
    • https://uploads.strikinglycdn.com/files/a94d41a8-fcd8-4222-9170-b0c3c2da2fb3/vozidawipigarusinakof.pdf
    • https://uploads.strikinglycdn.com/files/6d5197fe-4c5c-431a-9d9f-d25bf69929b5/59318643376.pdf
    • https://uploads.strikinglycdn.com/files/bda5fe98-d347-4091-822f-6f5414205c1d/sweatshirt_dress_pattern.pdf
    • https://uploads.strikinglycdn.com/files/d9bde7a6-1b74-4f56-9765-9410556ace8b/32216064661.pdf
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/pudisubiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ac.bin
7076b2ebc69503cacd2a6c04c4e06e36f207e3d82ad9408263fe26fe8a86dea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 5392 bytes
font_01_sfnt_off00007918.bin
10b642c0b1af7ec9d66f0af417ebdc01b18a200f41d63ee56037e0b6af9ae95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7918 10960 bytes
font_02_sfnt_off00009dfa.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFA 4324 bytes

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