Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba0ba6f33246251…

MALICIOUS

PDF

46.0 KB Created: 2020-09-08 17:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81fd99583f240a70a0b29717505391d4 SHA-1: f16d5a318c24d60808c42f82506b4f8e3d25d6ae SHA-256: 9ba0ba6f332462519441d8249a605c7b852980185138299887d4f0f2ba458823
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a phishing lure disguised as a game guide.

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://ttraff.com/wix?keyword=barony+game+guide In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/4b874d_7ab57362ecb14be78e34b3450c3d08d7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fb41f9_098d7eb0059e42818f2cf5fafd7c2464.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/82d61e_ee4efc3c9ffb426b85812f463fc1824b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eb4c03_4cf9516ffbed4051a54c381a5e9cba19.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5a4c69_d39c5bb0db654223b27ddccec0a61195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/68009476881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0113/4747/files/5026082869.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/432b07_f762e698a02e4de98cff31fbcd1ab6a6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a2c2bc_660968d639a942928a76fa656843d84c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/bovonezuwabubafazuvona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7371/5870/files/88235940963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/neurofibromatosis_ocular.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 3

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_off00006a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A55 4888 bytes
SHA-256: f8348436adc29043bab8b5e3c4c66d7da11a91d323c2718eb348da5cf5241f15
font_01_sfnt_off00007ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD2 10168 bytes
SHA-256: b00ec871868302801a4ef61b69dda5ec59bedf8496ec5a8792600258d4ba96f2
font_02_sfnt_off00009db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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