Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5820621e845c5fe…

MALICIOUS

PDF

44.6 KB Created: 2020-08-19 07:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c344d023e98159d2876bd8437c4c835 SHA-1: 79b9bd0162f2a58aa68f54b6bcf82102d04e4489 SHA-256: c5820621e845c5fe34ce46b35f6b850ba70d179188ab6af802e84e1410f20919
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, masquerading as an Apple beta software update. This is further supported by heuristics indicating a malicious redirector link and a link farm. The document body, though heavily obfuscated, contains the malicious URL, suggesting a phishing or social engineering attack aimed at tricking users into visiting a compromised site.

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=apple+beta+software+update
    • http://files.knittygrittysyr.com/uploads/1/3/1/4/131453588/7c60b59ee222e.pdf
    • http://dozelozib.xn--sptjeneste-25a.com/uploads/1/3/1/6/131636725/besef-kijojikevoga-mosose.pdf
    • http://files.officespace-klcc.com/uploads/1/3/1/6/131606563/699eb53a960200.pdf
    • http://files.nurseshantania.com/uploads/1/3/1/4/131453934/vufakosesarifigegap.pdf
    • http://xuwal.friend-vibes.com/uploads/1/3/2/6/132682646/5917524.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/33682037096.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8102/files/zawogo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/canon_eos_rebel_xs_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6695/files/67329545585.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/lilidogagepifos.pdf
    • https://cdn.shopify.com/s/files/1/0432/9842/2934/files/csgo_jump_throw_bind.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/fallout_ttw_mods.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/56721960008.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/3052691660.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/88743422346.pdf
    • https://cdn.shopify.com/s/files/1/0450/7323/6131/files/distal_bicep_tendonitis_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5190/files/streamline_english_download.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_off000071e0.bin
f186fd8b66c7b2f3daf8fdc3fe3c9b848ff523daf81ea628525862a20fb84bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E0 5256 bytes
font_01_sfnt_off000083d0.bin
b96e0ff8a2f3c38753efa006f6a49742ca182fe54851964c60a8bd4086f37313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D0 9812 bytes

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