Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3976309e9bb4289…

MALICIOUS

PDF

41.5 KB Created: 2020-07-10 10:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaaa930dbe9028226d3c77cd21353134 SHA-1: 4069e631aa1b79641de583fedf29bb7a9a854ffa SHA-256: a3976309e9bb428930e85fea17b9944b74158e45417727d3fc708bba3a9f99af
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to traff.com, suggesting a phishing or malware distribution attempt. The document body, while containing technical terms like 'Bridgeport milling machine maintenance manual', is likely a lure to encourage users to click the malicious links. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=bridgeport%20milling%20machine%20maintenance%20manual
    • http://files.customizablecrafts.com/uploads/1/3/0/7/130739294/7263800.pdf
    • http://files.findigo.co.uk/uploads/1/3/1/4/131438002/vosekifekuj.pdf
    • http://files.lovebarcelonacity.com/uploads/1/3/0/7/130739532/jonefovoluwoba.pdf
    • http://files.tubietsai.com/uploads/1/3/1/8/131871951/4755292.pdf
    • http://files.sopoochtraining.com/uploads/1/3/2/8/132815961/kawivibugakovuj.pdf
    • http://files.stpeterscatholicschool.com/uploads/1/3/1/4/131453045/judexikozajin.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://files.mcmjanitorial.com/uploads/1/3/1/4/131406356/5b2cce2e6e7ba.pdf
    • http://files.all-naturalchiro.com/uploads/1/3/2/7/132741020/zimiwusomujib-xulojuxe-buralizi.pdf
    • https://ruxikorodajo.files.wordpress.com/2020/06/906168552.pdf
    • https://suxixitewi.files.wordpress.com/2020/07/nuxedunapuxikasaj.pdf
    • https://motifomimiwa.files.wordpress.com/2020/06/zotujufarujuxifemebepaga.pdf
    • https://wedowejaz.files.wordpress.com/2020/06/vevefoxelarazi.pdf
    • https://zuweged26385481.files.wordpress.com/2020/06/bipazukuxoganenaxobab.pdf
    • https://ralidirudod.files.wordpress.com/2020/07/7037161305.pdf
    • https://jexuxadu.files.wordpress.com/2020/06/meluna.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37741658126.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kusamusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18813115042.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94260126358.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xizijifopaxefiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064dd.bin
538594192083541d5a0793f7970df687031f112c74cef1c1d85bb44aa9261c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DD 5240 bytes
font_01_sfnt_off0000766f.bin
25d4e375fe0cf011989650681664b56b78c975f2e227d4903a1be3c9aac2055e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766F 9872 bytes

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