Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11061bf2ea91853…

MALICIOUS

PDF

44.5 KB Created: 2020-07-30 14:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d808d8c3a4f857bb6ef1c0720bac08c6 SHA-1: 87e3f9aa708d44aca2a672b8646d25a37e1cbc34 SHA-256: f11061bf2ea91853927f96d36ec8485fdfc80f0aba0a92bfd79aad932b770659
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'ordering fractions worksheet pdf', likely a pretext to drive traffic to the malicious URLs.

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=ordering%20fractions%20worksheet%20pdf
    • http://files.thefastshopp.com/uploads/1/3/0/7/130776573/mumubevipo-neriragowal-pogozagoz-vitufola.pdf
    • http://files.vivastrangeboutique.com/uploads/1/3/2/8/132814306/1260376.pdf
    • http://files.vanessajaynefineart.com/uploads/1/3/0/9/130969561/989946.pdf
    • http://files.vanessajaynefineart.com/uploads
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/vivixenojirozozovabal.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6910/files/60408802702.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/55218324895.pdf
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/83402277964.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/98413727983.pdf
    • https://cdn.shopify.com/s/files/1/0430/0711/5423/files/duwudesotaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/fesawadetomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/vovuvipevidojukemeloja.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/fapev.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5033/files/36541878873.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nipexaledova.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/pofesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/vatataguxuripanesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/27940669442.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_off00007086.bin
fbe9f8954eee622080b471e2823a5d52ff64ccb8de6e289a30ada03cbdd1d0de
pdf-font-stream PDF embedded font (sfnt) at offset 0x7086 5356 bytes
font_01_sfnt_off000082cb.bin
f81d7fc6c4a640bfd78839ac2217429dceb507e1f61d9ccee2a97b1e661dad46
pdf-font-stream PDF embedded font (sfnt) at offset 0x82CB 9900 bytes