Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa697b5629a3fc8…

MALICIOUS

PDF

42.3 KB Created: 2020-08-05 13:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4270f8be8549416ce9d09c12ef817a72 SHA-1: 66deaa92dc73c570bdf6dd6a9f75bb8b512d8397 SHA-256: 0aa697b5629a3fc87ccadaec51ebb46ecff7896cad0b1379afc236eef5964e71
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many pointing to PDF files hosted on various domains, indicating a link farm strategy. One of the primary links, 'https://ttraff.cc/pify?keyword=amiodarona+farmacologia+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains a mix of text and what appears to be encoded data, but the presence of the malicious redirector and the link farm strategy are clear indicators of malicious intent, likely for SEO poisoning or to redirect users to malicious content.

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=amiodarona+farmacologia+pdf
    • http://files.delanonursery.com/uploads/1/3/0/9/130969185/puraguwimik.pdf
    • http://files.eaarmada.com/uploads/1/3/2/8/132814241/lijojabebeloma.pdf
    • http://files.3realms.ca/uploads/1/3/0/9/130969834/6f0eab43.pdf
    • http://tijaguta.huron-athletics.org/uploads/1/3/1/4/131453329/guruwujex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3257/5132/files/jakibomizenubimixuduvow.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6843/files/rogopox.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/kaxurirelirujupi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0133/files/fisogikavowit.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/kaxasotowuxipenomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/fonefoxupomejolojuzo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/fedatawagogot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3664/7317/files/jexafam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5355/files/70494854703.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/89877876910.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/54796302404.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/91049614387.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_off00006782.bin
829a6b4e170b4c92f42a25b24d32c5a662c3471d449a62f31e4230f9a28c61ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6782 5284 bytes
font_01_sfnt_off00007969.bin
00133a0bbb3ac70e01fa13cb7078fd7973abd37b5c9260e8c2b0b64e5a717c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7969 10092 bytes

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