Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48ab99d42c0cf59…

MALICIOUS

PDF

48.5 KB Created: 2020-09-20 11:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc0f70302eb94e14812dc98d1e92b92f SHA-1: 1d698bcacfd394d2bd49aefb73e030c7ecbed28b SHA-256: c48ab99d42c0cf59de4ba8712b1c0cd5b9e62eeccf62747ec6339889d18cadf0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including a known malicious redirector, indicating a likely phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of links suggests a link farm designed to lure users to malicious sites.

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.link/wix?keyword=davis+drug+guide+digoxin
    • http://files.southerntierstarlites.com/uploads/1/3/1/3/131379296/9385130.pdf
    • http://files.stjamesharlemnyc.org/uploads/1/3/0/9/130968996/c5fb0b50e4.pdf
    • http://polapusom.amadeusandco.com/uploads/1/3/2/6/132681352/zomedemonuwisajuval.pdf
    • http://defuxu.charischristianacademy.org/uploads/1/3/0/7/130776074/jilujijexunilej.pdf
    • http://files.borrower-friendlyloans.com/uploads/1/3/0/7/130775471/41869a88e21.pdf
    • http://files.sustainablemaize.com/uploads/1/3/0/9/130969428/vadosun_lomazezenu_bewufanoba_pofuxamotofe.pdf
    • http://dokukura.shopflirtrochester.com/uploads/1/3/1/4/131437294/72d524b4e99c48.pdf
    • http://lelawoboj.sustainhawaii.org/uploads/1/3/1/1/131164439/16164f00a.pdf
    • http://files.duikinstructeur-thailand.nl/uploads/1/3/1/4/131453194/gujajemijiwesuju.pdf
    • http://files.sunpawco.com/uploads/1/3/0/7/130740357/5894626.pdf
    • http://files.cedarcreekarts.org/uploads/1/3/0/7/130738850/fc9f6192.pdf
    • http://jasiw.pineypawn.square.site/uploads/1/3/1/3/131380213/parale.pdf
    • https://7bd2eb2e-b4e0-4c42-9767-9b4447266332.filesusr.com/ugd/cbe7f7_c528044f278f48e5825676f099c4fadf.pdf?index=true
    • https://ee4bb60c-ddc5-40f5-8ece-1892d4b9bb55.filesusr.com/ugd/fd4c29_671a14a98c3746f5a1d8cf97cc399a0b.pdf?index=true
    • https://81738fc2-6397-4830-9ccc-850221bb63a9.filesusr.com/ugd/cec570_dae8c53e51a445afb616296e5397eede.pdf?index=true
    • https://265a92cd-c872-432e-b7b1-9cca9923f1a0.filesusr.com/ugd/9ea9b6_ac9c9424dfce4e61a827191533c4536d.pdf?index=true
    • https://d90e4bcd-a296-48fb-a85d-90255f6d3b92.filesusr.com/ugd/95b9ea_678ca095164c489f971efbe308247141.pdf?index=true
    • 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_off00007113.bin
daf73a1b3283c8be3a5c3da812c8b1fe6fbbc96c8ff583f40a3c01f1d6c93c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7113 4888 bytes
font_01_sfnt_off000081bd.bin
d40390a95a245720cc22b93526bf85d66b6ac62b9b78afd0ddd8a0d3b003683c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BD 10976 bytes
font_02_sfnt_off0000a732.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA732 4324 bytes

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