Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f87ec421a1edc4b…

MALICIOUS

PDF

42.8 KB Created: 2020-09-08 17:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d56dc05157caa99c78377e1b6393e9fc SHA-1: 2a4c258c04f350cb7c34f2204571b054abf0df43 SHA-256: 8f87ec421a1edc4b3da51db7d7e5131851e045467b778f46f0305e4670947e30
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm for SEO poisoning or traffic generation. One critical heuristic identified a link to a known malicious redirector, ttraff.me, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains text related to 'worksheet math grade 2 addition' and the malicious URL, indicating a lure to encourage clicks. No scripts were extracted from this sample.

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.me/pify?keyword=worksheet+math+grade+2+addition
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/faguwisixotaran.pdf
    • https://cdn.shopify.com/s/files/1/0463/6249/3083/files/pomozefomeromiju.pdf
    • https://cdn.shopify.com/s/files/1/0437/4436/2647/files/94032401754.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/38034500943.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/zedaminez.pdf
    • https://static.usrfiles.com/ugd/be19e1_8c7342d06c004ff8a06c398324f7563a.pdf
    • https://static.usrfiles.com/ugd/6fd45c_d8d191aff9ce40a09314c4b025aac356.pdf
    • https://static.usrfiles.com/ugd/3e5d97_ca610593587e4224947539914ca4f807.pdf
    • https://static.usrfiles.com/ugd/77941b_f9ddd773349949419d7057ddc744a0d0.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/33011772567.pdf
    • https://cdn.shopify.com/s/files/1/0462/2601/4362/files/amazing_grace_piano_sheet_music_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/python_information_gain.pdf
    • https://cdn.shopify.com/s/files/1/0436/7787/6377/files/weladojogegipawaruxa.pdf
    • https://cdn.shopify.com/s/files/1/0460/9972/6500/files/vogepilanufufulobikowuma.pdf
    • https://cdn.shopify.com/s/files/1/0438/5941/1104/files/87115595169.pdf
    • https://cdn.shopify.com/s/files/1/0429/9934/9407/files/dictionnaire_des_antonymes_franais.pdf
    • https://cdn.shopify.com/s/files/1/0437/6572/7384/files/kufikoromewup.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9509/files/sapurudajoregazufila.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4206/files/mivexesefuk.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/
    • https://cdn.shopify.com/s/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000678c.bin
b03ae6c89cdb85c5ff2fcf741a7a80a7e7130baa5123e117a470835d9f0d485c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678C 5416 bytes
font_01_sfnt_off000079d9.bin
e5b26ab7964b136eb22aac3497a66d6b1be2fd432cb024af4b325be92341dfe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D9 10616 bytes

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