Malicious PDF — malware analysis report

Static analysis result for SHA-256 644096fc985de5e6…

MALICIOUS

PDF

47.1 KB Created: 2020-08-16 12:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8ddb68152061e097e61e0d77e426c61 SHA-1: b456140c57b38157457d1a2acad8afdc551b355a SHA-256: 644096fc985de5e6e7af7d53d7d5ade0ba480f83debe2fcca5f609742f4254f4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for an 'air quality index app'. The presence of many external links suggests a link farm or SEO poisoning attempt, likely to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.ru/pify?keyword=air+quality+index+app
    • http://files.theskinthatburns.com/uploads/1/3/1/1/131164534/f66e7e2f6bf.pdf
    • http://wawenapu.sara-n-mark.com/uploads/1/3/1/8/131871721/dugafime-xamalewuvesonav-defobonat.pdf
    • http://files.northeastsocietyforvascularnursing.com/uploads/1/3/0/9/130969489/furonukugojogogorol.pdf
    • http://liwikedo.ilovemytemple.com/uploads/1/3/1/4/131408984/lawewiwevazulobobode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/1781/9544/files/my_turbo_pc_free_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/4985/files/causes_of_stomach_ulcer.pdf
    • https://cdn.shopify.com/s/files/1/0452/9104/5026/files/bupib.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/komulaliw.pdf
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/masob.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/12278531424.pdf
    • https://cdn.shopify.com/s/files/1/0431/2426/1026/files/38237987225.pdf
    • https://cdn.shopify.com/s/files/1/0432/7168/4252/files/casio_fx_9860gii_sd_software.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/30852940675.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_off00007a2c.bin
ddd1cedadcb0610a06119c769d4be3fda9f02e68e01dcc9bdc0e6765c8cee3be
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2C 5060 bytes
font_01_sfnt_off00008b70.bin
92f307abe28cbbe2e4d5438499f0f349c38eab089df5d629b6caa07a282b1cac
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B70 10632 bytes