Malicious PDF — malware analysis report

Static analysis result for SHA-256 9522f8d6cdf20882…

MALICIOUS

PDF

47.1 KB Created: 2020-07-29 03:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cacc0a1384dc591c97fccc6eedfca9a SHA-1: 85b836b32bc49ab93e7e1475249494e3e4452a78 SHA-256: 9522f8d6cdf20882e04d6a0e34012af3e59a0c81285b4211b32753ee4849155e
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically `https://ttraff.ru/pify?keyword=payroll+system+flowchart+pdf`. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, many hosted on Shopify. The document body, though heavily obfuscated, suggests a lure related to a 'payroll system flowchart'. The primary attack vector appears to be social engineering via a malicious link disguised within a seemingly innocuous document.

Heuristics 3

  • 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.
  • 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=payroll+system+flowchart+pdf
    • http://files.kafyeblaan.com/uploads/1/3/1/8/131856381/becb5.pdf
    • http://files.mindbodyevolution.org/uploads/1/3/0/7/130775633/8153035.pdf
    • http://files.johnreesleather.com/uploads/1/3/1/6/131637658/f394e2.pdf
    • http://files.langeamchs.com/uploads/1/3/1/4/131411539/xinilixoguvovaj-jepatidoratodab-gilaxepag.pdf
    • http://files.frankmarcopolos.com/uploads/1/3/2/7/132710797/fimulu-resemogus-gevenanivuxeze.pdf
    • http://files.langeamchs.com/uploads/1/3/1/4/131411539/xinilixog
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/56744873293.pdf
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/fimawojomifanefufidu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1623/files/12962425533.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/60386608241.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/26282349480.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/99154844580.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/42263856378.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/vemapasutamojes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/xovejukirumila.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/rezupinipobevuzeguzimi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/51581633960.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/4497635839.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_off00007bc5.bin
8268e6c2735683269cdd42dd7e7ed84fea6e7e29ebd20e70ac9731726e555cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC5 5224 bytes
font_01_sfnt_off00008da7.bin
2684c9c63f3e881a22e1908aca2bbfe221946c53be6a3064863b1e7885cc0452
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA7 9928 bytes