Malicious PDF — malware analysis report

Static analysis result for SHA-256 772d5b3e362d0724…

MALICIOUS

PDF

49.0 KB Created: 2020-08-18 21:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b163a16ce2e79a69576e841ba38811bc SHA-1: db27a881d57d4e1127cd50dbbe2d8459a24db6f2 SHA-256: 772d5b3e362d072420e3c0ea10d876b094e08f25a782f171701f2cfebbf483f8
162 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service, indicating a link farm or redirection attack. The document body text, though garbled, contains a URL that appears to be a lure for a 'school admission form'. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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.
  • 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.cc/pify?keyword=school+admission+form+pdf+format
    • http://files.aarestoration.com/uploads/1/3/0/7/130776763/rajigevekese.pdf
    • http://files.352coaching.com/uploads/1/3/1/3/131383544/julotide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/vulabipuzovekuram.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3030/files/react_native_emulator.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3799/files/81931411374.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/dosabepupun.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4693/files/43373521470.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5265/files/3382545289.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/pefemozukaliwavunika.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/job_application_letter_for_english_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/buffalo_wild_wings_menu_sauces.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/xarufevelusaxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/begedijanigusifixasag.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/34830555060.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/sony_cyber_shot_manual.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_off00007cb8.bin
cff7b4010e2773905a208450b14fed2edfd0530a62fa43d3cc6c06ed35d2fff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB8 5500 bytes
font_01_sfnt_off00008f38.bin
b7f12fd96f9bd617bf415bb4ec8d431f6e1450daed18629f07fb40d4799e1ba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F38 12284 bytes

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