Malicious PDF — malware analysis report

Static analysis result for SHA-256 591c96b896d40220…

MALICIOUS

PDF

42.1 KB Created: 2020-08-03 04:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1e4c5d037b627d0818c8e17aadb555 SHA-1: a0fa5f996be0129dcf241e2be51e6f8018d23341 SHA-256: 591c96b896d402206fe1dcf8f2d57012107cd6c6d50539fcbd13b0f8bec2c28d
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text related to software installation, which is likely a lure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=install+memcached+on+mac, which is used to redirect the user to further 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.ru/pify?keyword=install+memcached+on+mac
    • http://files.ccsdanalytics.com/uploads/1/3/1/4/131437308/3cfdbdab66.pdf
    • http://files.carmandalepersians.net/uploads/1/3/0/9/130969300/cea744267b.pdf
    • http://files.qiman.org/uploads/1/3/0/7/130739353/63752.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/pudujamekitowam.pdf
    • https://cdn.shopify.com/s/files/1/0434/5610/2565/files/sofujezuruvasoritenep.pdf
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/choke_canyon_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/2606/9157/files/fogokijixejafimelofivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8112/2471/files/evinrude_fisherman_6hp_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/61276595447.pdf
    • https://cdn.shopify.com/s/files/1/0432/0827/8171/files/43884794767.pdf
    • https://cdn.shopify.com/s/files/1/0437/4301/9159/files/66763303173.pdf
    • https://cdn.shopify.com/s/files/1/0432/7594/4091/files/lafipawulakovek.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/knockout_js_bind_to_hidden_field.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/zunesilinukozejoxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7081/6407/files/dazeturenimozetob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bb5.bin
50681c0d381296aaf639a83e03a02b08780cc8b5263d85150229a11368522e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB5 5020 bytes
font_01_sfnt_off00006c96.bin
0d9fe11318acc6bee60e7a0c04c40551a8bb1823277991e2c1da9f63e7481183		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C96 2452 bytes
font_02_sfnt_off0000774d.bin
2f57edb0e7c3cc50941609a33536ccb0f596739955c739eb60b2c01dd72603f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774D 10592 bytes

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