Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3af83e68df5a5c…

MALICIOUS

PDF

45.0 KB Created: 2020-08-09 20:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e78967cafea135e5a85177c57de5a3fb SHA-1: e57ba177a78ee1a707a80b18bf0e9d87e776c54b SHA-256: 1c3af83e68df5a5c6e73180ecd4c90eff4a43e00fc56f9683761aa1b199078e4
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an 'Ayurvedic medicine price list pdf'. The link points to 'https://ttraff.com/pify?keyword=ayurvedic+medicine+price+list+pdf', which is a known malicious redirector. The document also features a link farm with numerous external PDF links, many hosted on Shopify, likely to improve search engine ranking and distribute the malicious payload. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=ayurvedic+medicine+price+list+pdf
    • http://tumudume.stewartvillesportsmansclub.com/uploads/1/3/2/8/132814930/889035518.pdf
    • http://mapumepe.3matstories.com/uploads/1/3/0/7/130776485/medolimalinomej.pdf
    • http://files.hoppymeadowsrabbitry.com/uploads/1/3/1/3/131379671/savesidibuj.pdf
    • http://files.christiancounselorcooperative.com/uploads/1/3/1/4/131411539/786efb8eceba4.pdf
    • http://files.ahitalukdar.com/uploads/1/3/2/6/132695298/4015d35b.pdf
    • https://cdn.shopify.com/s/files/1/0434/3280/4504/files/9476342152.pdf
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/fixifojadigudegopufajezag.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/46721583967.pdf
    • https://cdn.shopify.com/s/files/1/0428/8351/4527/files/39749237652.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6041/files/56541222642.pdf
    • https://cdn.shopify.com/s/files/1/0431/1672/4386/files/tarelugomoxanako.pdf
    • https://cdn.shopify.com/s/files/1/0429/0877/8663/files/southwest_airlines_print_boarding_passes_and_security_documents.pdf
    • https://cdn.shopify.com/s/files/1/0440/4363/2805/files/engineering_drawing_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4600/files/vigolokar.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/impactor_peer_certificate_cannot_be_authenticated.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/93262843652.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006389.bin
be29d6cdb068dbee69ee7c39b1c8290a4ad40cb0c5964cd1a83113fab30b96e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 5016 bytes
font_01_sfnt_off00007484.bin
fac03f9b0a841da87c2324e7c19233e8b67faaa0863ebcb52f4865622e47d522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7484 10260 bytes
font_02_sfnt_off00009773.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9773 4324 bytes

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