Malicious PDF — malware analysis report

Static analysis result for SHA-256 823c299c4f75e12b…

MALICIOUS

PDF

41.3 KB Created: 2020-08-21 11:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b6ed6614d29c5e6db1ea71acc28af0 SHA-1: 369901d64e8e4ca65072c400a5318aeb1b0da4bc SHA-256: 823c299c4f75e12b187ba5521a0534a4e546219d2c32d30bf0108265e798c061
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text and embedded links suggest a lure to external content, potentially for phishing or SEO abuse.

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=answered+on+another+device+means
    • http://wevuzor.futurefitness4allofyou.com/uploads/1/3/1/4/131454165/sejogunekizema_bosepi.pdf
    • http://files.mywonderowl.com/uploads/1/3/1/0/131071289/8585379.pdf
    • http://files.broadwaysilkens.com/uploads/1/3/0/8/130813834/3164757.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/ffxiv_blacksmith_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8904/files/short_and_long_term_memory.pdf
    • https://cdn.shopify.com/s/files/1/0436/6260/6489/files/dewalt_dw682_plate_joiner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3645/files/pdf_of_biochemistry_by_lehninger.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7474/files/syndicate_emblem_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/95518842665.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/vonijazagiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/fusaxafajemotuwosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/missing_alphabets_worksheets_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96280370261.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7190/files/60774647968.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2471/files/11855084515.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/grade_2_math_review_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/slow_dance_adventure_time.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_off00006403.bin
66d19c0252cfabc8b2494aa7c1070ee7d44d0e25984bbd25fb3359d8f1416b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6403 5288 bytes
font_01_sfnt_off000075e3.bin
b7912fde56eff4b56968989dbae9f53e2363a7661fe593329cf8bca7d61c85e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E3 10112 bytes

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