Malicious PDF — malware analysis report

Static analysis result for SHA-256 0407d1771eb3ad6d…

MALICIOUS

PDF

52.5 KB Created: 2020-08-05 14:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caae9349a89db7460caad7694124c2af SHA-1: 325307a09138d2ebf75cbe39eef7302421ad98ee SHA-256: 0407d1771eb3ad6dd67ca075cc394a71ea573b51d85f7a9aa7b3b013f2e0cd51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that leads to a known malicious redirector. This suggests a phishing or scam attempt designed to drive traffic 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.cc/pify?keyword=english+english+tamil+dictionary+pdf
    • http://files.justcoconotchanel.com/uploads/1/3/0/7/130740200/fefuvuji_lubemenipakizuk_jagapo.pdf
    • http://vumofof.maynardcattleco.com.au/uploads/1/3/1/4/131437812/denuguzaf.pdf
    • http://torubovub.bluemountainseimei.com/uploads/1/3/1/1/131164243/walivimavedebe-bixaralojudofev-sijamalexosuwa-futemovatojef.pdf
    • http://files.mslangseportfolio.org/uploads/1/3/1/8/131856398/5a4a2e1f6.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/livofelujeromovavoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/82930618169.pdf
    • https://cdn.shopify.com/s/files/1/0433/7460/8545/files/81023517183.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/54927659845.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/84365379993.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98690712505.pdf
    • https://cdn.shopify.com/s/files/1/0434/2707/0104/files/vadibotosevu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/95940881593.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/5286046127.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3511/files/wafim.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8423/files/gapugesuweze.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5276/files/autocad_turn_off_frame.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.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
stream_005_off00007b53.bin
070ef8dc13ebb2ed1563d65172be84b84205f8caf5a3feb4e8ea5fa4e21618bb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7B53 16496 bytes
font_00_sfnt_off0000684e.bin
d2636f7160d37dc6d5d6e462304e42d2b898481474490457df82d4566174bf80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684E 5628 bytes
font_02_sfnt_off0000a0ba.bin
431e14322ec03bc608c7507e247c06de6dbb653f2c182c63b2e5ed6ce02b3e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0BA 10388 bytes

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