Malicious PDF — malware analysis report

Static analysis result for SHA-256 695fb89ec3f1dbf4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 16:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d360284f3614329b77e362b720cff25e SHA-1: afb92e777b3b7e05ea417613bfdba2310365f795 SHA-256: 695fb89ec3f1dbf464e9c7bf0d33adf3a2ce778ce573a1f4be2d8464ab522bd6
194 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 potentially malicious redirectors or unknown domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'ttraff.cc', indicating a redirection to malicious infrastructure. The ML classifier also strongly indicates maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise the malicious intent.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=sample+pdf417+barcode
    • http://files.centralmississippirobotics.org/uploads/1/3/1/0/131070911/babonujesa.pdf
    • http://files.newcanaandems.org/uploads/1/3/0/8/130874257/gufipobukawogovesi.pdf
    • http://files.coronavirusremotepatientmonitoring.com/uploads/1/3/1/4/131407028/8677914.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/63607216757.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2633/files/62230988814.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/nopolopopo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0454/files/20947310250.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/17725325319.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8450/files/fiwizepuzif.pdf
    • https://cdn.shopify.com/s/files/1/0437/2958/4293/files/lupejivivosalidebubewag.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/49549666334.pdf
    • https://cdn.shopify.com/s/files/1/0435/5584/8355/files/41849162391.pdf
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/sobufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77650869017.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/50865648467.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0436/1748/4957/files/12058271564.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/34067064961.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_off00006431.bin
7742fab9f70c923affeb327d8173344d66bba5d44ec81ba5d8c531603d85fbd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 5588 bytes
font_01_sfnt_off00007728.bin
bf12e3e7d04291d8b7a88d34910d0e0a156c9308687f0128b5099a39d2ab3684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7728 9940 bytes

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