Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fac91c67d187ef…

MALICIOUS

PDF

47.4 KB Created: 2020-08-10 08:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b726a0f979337e935faa2e4c07860241 SHA-1: a54c3d92ea8d4e9efab127a7daa266b5d5348a11 SHA-256: 05fac91c67d187ef943ed8f27a27f8996b42c9815ba151b324c89bb14e490778
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malicious content. The heuristic firings indicate the PDF is designed as a link farm, likely to improve SEO for malicious content. Although no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent, likely to redirect the user to a compromised site or phishing page.

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=air+pollution+causes+and+control+pdf
    • http://files.cabincreekfarmstudio.com/uploads/1/3/1/3/131379939/vetiludasokozana.pdf
    • http://files.swpahro.com/uploads/1/3/0/8/130813095/5456126.pdf
    • http://doxadesam.sascwa.org/uploads/1/3/1/1/131163635/ruwumurofoxazijagowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/xigitilomu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/zorubanenuxaki.pdf
    • https://cdn.shopify.com/s/files/1/0439/7708/0990/files/pupin.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/dipon.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/tetibipeva.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/64806606194.pdf
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/39742839493.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/acetazolamida_mal_de_altura.pdf
    • https://cdn.shopify.com/s/files/1/0440/2606/9157/files/86116007789.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/ranezaxijunomena.pdf
    • https://cdn.shopify.com/s/files/1/0428/7925/4694/files/40219259489.pdf
    • https://cdn.shopify.com/s/files/1/0438/3630/9666/files/fiwupivuzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7369/2063/files/69964862369.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_off00007b8c.bin
c771d0b5e04f88044c33e6dec9363c9e88e7fccf1716764ee7c42915f4efa203
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8C 5140 bytes
font_01_sfnt_off00008d16.bin
cbb4de971aac92f83a701965616b53a6d9e36decb52096395f3e8bf7b49e67e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D16 10508 bytes