Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c7f71335d1cdd7…

MALICIOUS

PDF

48.2 KB Created: 2020-07-09 20:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c3db7c78bb4aa399bed3f4275352b55 SHA-1: f1913cbc14c68cbddcb44e471df31f48e7bb7cd1 SHA-256: 82c7f71335d1cdd7e4467af447122bd80322f3f629582dd05526b29b1bcac323
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple critical heuristics for containing a large number of external links, including a known malicious redirector. The document body itself contains obfuscated text and numerous URLs, suggesting an attempt to lure users to malicious sites. The presence of a malicious redirector and a link farm indicates a likely phishing or malware distribution campaign.

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.com/wb?keyword=peel%20me%20a%20grape%20diana%20krall%20pdf
    • http://files.pjeterkoleci.com/uploads/1/3/2/6/132681938/f414f68e3faf.pdf
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdf
    • http://files.seizediem.com/uploads/1/3/1/4/131438741/vewim_gifesimefipotu.pdf
    • http://files.corinnehollowayart.com/uploads/1/3/1/8/131872015/4f5ce6.pdf
    • http://files.thecharagroup.com/uploads/1/3/0/9/130969294/13ed209530.pdf
    • http://files.elitegymsamui.com/uploads/1/3/1/0/131069910/9074f65.pdf
    • http://files.norawickman.com/uploads/1/3/0/9/130969907/6315497.pdf
    • http://files.eugenemontgomery.com/uploads/1/3/1/4/131438766/zesolabugilobe.pdf
    • http://files.sanmateolimos.com/uploads/1/3/1/3/131383553/612544a.pdf
    • http://files.albadrivingschool.com/uploads/1/3/1/4/131406835/rivavugomajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://lezuvovefoga.files.wordpress.com/2020/07/dikabatubuzix.pdf
    • https://zasolifi.files.wordpress.com/2020/06/98286203513.pdf
    • https://tijitote.files.wordpress.com/2020/06/4957184770.pdf
    • https://ratomanedaz.files.wordpress.com/2020/07/51730012467.pdf
    • https://juxotig.files.wordpress.com/2020/07/75009441893.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ziduvawijixivobufanevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mirogorozizodixomalejog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/medarovadujagowurevasote.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rafudegilezenetizaxesuvos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetelonum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000638a.bin
10db3e2c76c2de398386ee3c040eb0c7acdbf3da5ac5b15417808cd79d0307ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638A 5468 bytes
font_01_sfnt_off0000764c.bin
3b968154192ab75b8b8ccc56db8b7fc38284f43c90d0695c931b7348834cc9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764C 4844 bytes
font_02_sfnt_off0000869b.bin
4fdab4e370c2487b8ecc294e83f255e43bce4da5fa0770bc430f209a61cc12fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x869B 14416 bytes

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