Malicious PDF — malware analysis report

Static analysis result for SHA-256 35733743855cc181…

MALICIOUS

PDF

56.9 KB Created: 2020-08-11 23:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e20e925b16a67372fed1bdf9bb2501b2 SHA-1: 5c2926153652e7bed728a240c6808771edabf61a SHA-256: 35733743855cc181c9eb44222d687ca4b71dc8947bb3db7768282136710a0f2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=probiotics+benefits+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=probiotics+benefits+pdf
    • http://sozedibep.alexiskyriak.com/uploads/1/3/1/0/131070313/xosikowexivozena.pdf
    • http://files.diversitech.us/uploads/1/3/1/0/131071043/725616.pdf
    • http://files.m25initiative.org/uploads/1/3/1/4/131453022/882607.pdf
    • http://bozokama.framedbytheword.com/uploads/1/3/0/9/130969060/5916196.pdf
    • http://files.paradisevalleypto.org/uploads/1/3/1/4/131454916/goworop-vibafegilow-puzipapava-nolugonokux.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/danukanufipinudufufasa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2769/2695/files/dimomimososelarokekuxil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/adenocarcinoma_del_intestino_delgado.pdf
    • https://cdn.shopify.com/s/files/1/0432/2040/2336/files/automate_the_boring_stuff_with_python_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/jofutubed.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/91023159731.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/xetat.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/what_tablet_does_shigetora_use.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/gonavuwosuwubalof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4302/0183/files/20969539517.pdf
    • https://cdn.shopify.com/s/files/1/0450/4656/2966/files/88868552887.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/fimutidoletotogesuji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/26641710134.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_off0000a141.bin
5a17975ff6649913a076d9eee399bbb5971dd8d9071f2d3e23cd5c7d86de14da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA141 5048 bytes
font_01_sfnt_off0000b273.bin
e1e43f00f5e2de5e5f7675f22a322c917ef7fc534918756e9c5231c93ac388c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB273 10488 bytes

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