Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b20fbaccef9181…

MALICIOUS

PDF

50.0 KB Created: 2020-08-08 06:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5617e0b53b9b16c86b37e476306a09 SHA-1: 3ffb153f36edfc47663044f27cbd0ecbc88e34c6 SHA-256: a1b20fbaccef9181228603f826ff1817bcdee3e948f2a64b3c96bdc61ebaf8ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. This redirector leads to a URL containing 'oxford english dictionary full pdf download', suggesting a lure to entice users to click. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm designed for SEO manipulation or traffic redirection. No scripts were extracted, and the document body was heavily obfuscated, but the primary malicious activity is the redirection to a known malicious URL.

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.cc/pify?keyword=oxford+english+dictionary+full+pdf+download
    • http://lawizi.marketingjpm.com/uploads/1/3/1/4/131409090/1d27c0bc7b7.pdf
    • http://files.betheluccspringgrove.com/uploads/1/3/0/8/130813973/1763275.pdf
    • http://files.ianlinden.com/uploads/1/3/1/1/131164016/rikobusadatovup_vobazom_debobexi.pdf
    • http://files.itiswritten.net/uploads/1/3/0/7/130738666/kenusasun-pugixamebakaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/7766/4929/files/68005012976.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/gifijaduxeruxoketiruzimo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/jujisiselazizinubuxuzo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/leroku.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/zofibirulugujexewujig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5857/files/95115270734.pdf
    • https://cdn.shopify.com/s/files/1/0429/1067/9203/files/98594074654.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/tp_link_archer_c2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/fununavilumawapugamexo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/68207948774.pdf
    • https://cdn.shopify.com/s/files/1/0449/3488/9627/files/emotional_development_during_adolescence.pdf
    • https://cdn.shopify.com/s/files/1/0431/2947/1130/files/bioassay_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/90224604118.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/
    • https://cdn.shopify.com/s/files/1/0449/3488/9627/files/emotional_development_during_ad

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c11.bin
4f175a6e019f280b1f37993272cad2a8c4d5a5f411f802d13e1fac73804c42d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C11 5704 bytes
font_01_sfnt_off00007f98.bin
0b71e08ec75d417171144ff99b6a112a09a95b00f38caa901c74754903d6c7ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F98 10576 bytes
font_02_sfnt_off0000a3e7.bin
4354bd37e85197a997b2f6c8c8698034d2711068b41d1b66819094364c364bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3E7 16544 bytes

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