Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4f437712b5e231…

MALICIOUS

PDF

69.2 KB Created: 2020-08-03 06:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ced335b6e0852f56c0a7b16d8007c0c SHA-1: c06567261137088f3ffb39662d79b0a026a3fc27 SHA-256: 6e4f437712b5e23166e853c56641c39a7496f3f689110d98e1b09207922042dd
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including a critical finding of a malicious redirector and a link farm. The document body, though heavily obfuscated, contains a URL that appears to be a lure for game mods. The presence of multiple external PDF links and a malicious redirector suggests an attempt to lead the user to malicious content, likely for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=7+days+to+die+mods+alpha+17
    • http://rogop.ambervalleylabourgroup.org.uk/uploads/1/3/1/6/131607095/1934062.pdf
    • http://files.wellnessfeast.com/uploads/1/3/0/8/130874350/texowu.pdf
    • http://files.thenottinghamfour.com/uploads/1/3/1/4/131437307/9017212.pdf
    • http://files.missionviejoclassic.com/uploads/1/3/1/4/131453541/d43cd1da.pdf
    • http://files.palmbeachdayacademycoralproject.com/uploads/1/3/1/1/131164009/7865369.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/71368972136.pdf
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/missile_war_server.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/nokanexezewibulu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2009/8472/files/lafopegowumodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0310/0836/files/lutilanibexo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6919/1832/files/tokozewopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8334/1728/files/43643669173.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/67698857981.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/xitule.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adc6.bin
288cef365d9dfc47e46fa6c6baa531df05399ab6939d46bf8edd27f0089f081e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC6 5240 bytes
font_01_sfnt_off0000bf7f.bin
e2f3dd50e87cc64f7716bb9974e6f9727065193202cee28103165e0cf82097a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7F 3232 bytes
font_02_sfnt_off0000ccb8.bin
ba8bb11ba9bd9eb92812cca634bfda2bfb1f401718b98ee2fdc30f0e203d866b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 10816 bytes
font_03_sfnt_off0000f1aa.bin
0496de3eedce77c5ddf4342598bf11e73a7ab7611c7043b71dd2835c39113ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 16324 bytes

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