Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e832f435cf4d1f3…

MALICIOUS

PDF

52.0 KB Created: 2020-09-01 17:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64cd9fc94e14a25b3b53cd7dda4e0795 SHA-1: 535a41ec5f54ebd3d3cd77bf50d823e190f9c903 SHA-256: 6e832f435cf4d1f3d3ca9ab7438cb64eecaf42a93825d100d4f9bd27e9db2d2c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=math+problems+with+answers+pdf', suggesting a lure to a malicious site. The presence of many external PDF links also indicates a link farm, a common tactic for SEO poisoning and driving traffic to malicious sites.

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://ttraff.me/wix?keyword=math+problems+with+answers+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/62204603875.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/70974271239.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7141/files/miller_heiman_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/wopezugosenugototosumib.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/34822038375.pdf
    • https://static.usrfiles.com/ugd/60933b_06b320f51b4d4a6e847414d57a7456a8.pdf
    • https://static.usrfiles.com/ugd/eb4c03_bccbd77922ed4ca988f6be9994591ae4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c8c73af705e405ab11aaf9e478b56bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_beba4432736d44e8bebca1d18845bce3.pdf
    • https://static.usrfiles.com/ugd/b8c837_232b2ce46f504b449e36880dc647fa5a.pdf
    • https://static.usrfiles.com/ugd/1cfe37_9e56a8af11984cacacd5bb82c47f5b59.pdf
    • https://static.usrfiles.com/ugd/54fa57_3cb1d308d17841e4be7c123accd33aff.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/big_ideas_math_algebra_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/1624/7703/files/fofulirebav.pdf
    • https://cdn.shopify.com/s/files/1/0438/8156/2280/files/79266366957.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/zobotuvifekuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/betibifelifimedejun.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_off0000691f.bin
f9bfc67537331d424d0851a08425f2e0afc3e6b4b2b3376ecdada2cc3c3abd67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691F 5516 bytes
font_01_sfnt_off00007bc3.bin
f5a3e0886b95c9b467f99b5e94d28133f575fbf2270330b68ad91cfe8bde1cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC3 1884 bytes
font_02_sfnt_off000084e1.bin
8c707e94017665dbe4253acf46562902504efc27cafd9c553765dd66397cd3eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E1 11220 bytes
font_03_sfnt_off0000ab4c.bin
f255b3d9fe3743734c422bdf22d4e11b00bbda096b77853fcfae3fc416bb4409		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4C 16560 bytes

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