Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cbfe5eb3831fd7…

MALICIOUS

PDF

44.1 KB Created: 2020-08-08 19:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4ac174c71af88a94d8ca576d114f196 SHA-1: fc3adae6840c19923e1bd82c299860a3a609683b SHA-256: 22cbfe5eb3831fd79b2cc9fededcab60d05ff086c46188a631df33e214600c3e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially garbled, contains text related to 'apgar score pdf indonesia' and a URL pointing to a redirector. This suggests the PDF is part of a link farm or SEO poisoning campaign, aiming to trick users into visiting malicious sites by disguising them as relevant documents.

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=apgar+score+pdf+indonesia
    • http://files.gekkonidazed.com/uploads/1/3/0/7/130776823/zedizovanonosovuxiju.pdf
    • http://gototobel.songinflightrecitals.com/uploads/1/3/2/6/132680813/vafaforapopopipalud.pdf
    • http://files.dudleyfoundation.org/uploads/1/3/2/7/132712235/8157470.pdf
    • http://files.fullspectrumdoulacircle.com/uploads/1/3/1/3/131379732/nugaxejojilerebeduji.pdf
    • http://files.tonyluciani.ca/uploads/1/3/1/0/131070859/1155373.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/18202836070.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/zebevixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/32788467528.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/vovuke.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/55039828581.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/wooldridge_econometrics_5th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/snake_game_html.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/zuwejabuve.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/nafamuvojujolukulek.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/mibifofukudowixumop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/27907001587.pdf
    • https://cdn.shopify.com/s/files/1/0439/2642/1672/files/quilt_border_ideas.pdf
    • https://cdn.shopify.com/s/files/1/0428/7486/3772/files/3319064931.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_off00006c72.bin
9b104783ddb43e855d8946739ff8d0a1cbdcdc3eb87afaf8bd0535a10a72adeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C72 5280 bytes
font_01_sfnt_off00007e7c.bin
78bd0b568a73417c3f787a5469b8f3e5b21b2130b49387da1090e9e41a5e06e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7C 10296 bytes

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