Malicious PDF — malware analysis report

Static analysis result for SHA-256 a607bb4cb5680a26…

MALICIOUS

PDF

39.4 KB Created: 2020-07-31 04:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d466cebb4015e9c9ad277dfe896fa7ab SHA-1: 5ad1f4509a8edb049701416cc840e3221f110874 SHA-256: a607bb4cb5680a26b96af5cb4df5e21b3fb013163b8caa77ff465d89d04e45d4
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning model as malicious and contains a large number of external links, with one pointing to a known malicious redirector. The document body appears to be malformed or obfuscated, but the presence of the 'neufert architect s data pdf online' string suggests a lure. The primary attack pattern involves redirecting users through a link farm to potentially malicious content.

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=neufert+architect+s+data+pdf+online
    • http://files.emmadurkanmusic.co.uk/uploads/1/3/0/7/130775592/livokixematenifeni.pdf
    • http://files.skilledpaint.com/uploads/1/3/0/9/130969254/dazetefeku-mowodosikifujel.pdf
    • http://files.littleladiessociety.org/uploads/1/3/1/8/131871740/veviguz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/bakojodiketolatosukotigud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/kasaxodif.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/16092260862.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32852202686.pdf
    • https://cdn.shopify.com/s/files/1/0429/2290/1663/files/fegejuluzukomoxeri.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/xipivotuzor.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/pifakasetosejizapini.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58829080427.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/mefimoworo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/59698767769.pdf
    • https://cdn.shopify.com/s/files/1/0428/9924/3174/files/49866194816.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/32203550794.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/files/1/0429/2290

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dd6.bin
ec27904919fee1fb9fa7145368cf40257beb0c3bfbcde63705267de16c215a8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD6 5096 bytes
font_01_sfnt_off00006f1c.bin
0cadab95027a71beaf8bc48ba31c18f1648a925168c9a90faf302b3765fc182d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1C 9844 bytes