Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c27e1a822df7765…

MALICIOUS

PDF

41.7 KB Created: 2020-08-20 00:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3131f88e5484bdcd3e25140d5d2bf90 SHA-1: fbf0243801c14b3f4aac204b30de61ad8a15bbee SHA-256: 5c27e1a822df77650b0fcf4983f1c5341fd4b5707a915b220b6b2fb6fc1e0d7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users searching for educational materials. This suggests a phishing or scam attempt to redirect users 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.cc/pify?keyword=number+worksheets+for+preschoolers+free
    • http://rovod.englewoodzumba.com/uploads/1/3/0/7/130776054/jonelelimetaxanolur.pdf
    • http://kepivuvam.crossfitremix.com/uploads/1/3/1/4/131453247/ruwabaje-fugoku.pdf
    • http://fogoro.mayflowerofbillings.com/uploads/1/3/0/7/130739625/vokiwasolem.pdf
    • http://jinumu.shootlikeagirlllc.com/uploads/1/3/0/8/130874493/kepijonefofesarutis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/pefepumu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/cessna_182t_g1000_poh.pdf
    • https://cdn.shopify.com/s/files/1/0433/8801/0659/files/modogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0881/1427/files/c_redistributable_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/4210/2679/files/printable_optical_illusions_brain_teasers.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/creative_writing_worksheets_for_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/30_day_abs.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9861/files/7409497321.pdf
    • https://cdn.shopify.com/s/files/1/0428/5169/6796/files/96059328310.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/52012610943.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/78240725717.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/court_reporter_pay_in_texas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/instagram_like_bot_free_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/39601980338.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006496.bin
ef140a092932ec833604603437a865ed6b1225eae4799b83eb67db37423eac05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6496 5308 bytes
font_01_sfnt_off0000769c.bin
8c7a03f8be6a562f373dfd475c344cd7229dcddb46c9519cb4a87814d52398e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769C 10104 bytes

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